This case-sensitive code system http://terminology.hl7.org/CodeSystem/v3-HL7ContextConductionStyle defines the following codes in a Is-A hierarchy:
Code
Display
Definition
C
conduction-indicator-based
Definition: Context conduction is defined using the contextConductionCode and contextConductionInd attributes on ActRelationship and Participation.
UsageNotes: This approach is deprecated as of March, 2010.
I
inferred
Definition: Context conduction is not explicitly defined. The recipient of an instance must infer conduction based on the semantics of the model and what is deemed "reasonable".
UsageNotes: Because this approach can lead to variation in instance interpretation, its use is discouraged.
V
vocabulary-based
Definition: Context conduction is defined using the ActRelationship.blockedContextActRelationshipType and blockedContextParticipationType attributes and the "conductible" property on the ActRelationshipType and ParticipationType code systems.